URL Canonicalization using two names possible due to wordpress upgrade

1 week ago I had "myname.com" set as the main domain on my wordpress multi-site set up with myname.com being on blog 1. Meaning "www.myname.com" would redirect to "myname.com"

Now 1 week later and after a wordpress upgrade, the "www.myname.com" no longer redirects to "myname.com"

Any ideas on how to get it back to working how it was before? I am using the mapped domain plugin however i think this issue is separate from that plugin on my other subblogs.

Thanks.